Two-band model of Raman scattering on iron pnictide Ba (Fe1-X Co x) 2 As 2 superconductors

C. S. Liu, Hong Yan Lu, W. C. Wu

Research output: Contribution to journalArticle

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Abstract

Based on a two-band model, we theoretically study the electronic Raman scattering spectra in both normal and superconducting states of iron-pnictide Ba(Fe1-xCox2As2 superconductors. In the normal state, due to the match or mismatch of band hybridization and Raman vertex symmetries, overall B2g Raman intensity is found to be much stronger than that of the B1g channel. Besides, in the non-resonant limit, there could exhibit an interband excitation peak at high frequency ω7.3t1(6.8t1) in the B1 gB2g) channel with t1 the nearest-neighbor hopping. In the superconducting state, due to the composite effect of Raman vertex, gap symmetry, and Fermi surface topology, both B1g and B2g Raman intensities are dominated by α- (β-) band contribution for the extended s-wave (dx2-y2-wave) pairing, whereas both bands are equally important for the - wave pairing. It is shown that both extended s- and -wave pairings can lead to a good fitting for the reported B1g data Muschler et al. (2009) [11], while the dx2-y2-wave pairing seems not favorable.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume501
DOIs
Publication statusPublished - 2014 Jun 15

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Group 5A compounds
Superconducting materials
Raman scattering
Iron
Raman spectra
iron
apexes
Fermi surface
Crystal symmetry
symmetry
sands
Fermi surfaces
Sand
topology
Topology
composite materials
Composite materials
electronics
excitation

Keywords

  • Iron pnictide superconductors
  • Raman scattering
  • Two-band system

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Two-band model of Raman scattering on iron pnictide Ba (Fe1-X Co x) 2 As 2 superconductors. / Liu, C. S.; Lu, Hong Yan; Wu, W. C.

In: Physica C: Superconductivity and its applications, Vol. 501, 15.06.2014, p. 44-50.

Research output: Contribution to journalArticle

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AB - Based on a two-band model, we theoretically study the electronic Raman scattering spectra in both normal and superconducting states of iron-pnictide Ba(Fe1-xCox2As2 superconductors. In the normal state, due to the match or mismatch of band hybridization and Raman vertex symmetries, overall B2g Raman intensity is found to be much stronger than that of the B1g channel. Besides, in the non-resonant limit, there could exhibit an interband excitation peak at high frequency ω7.3t1(6.8t1) in the B1 gB2g) channel with t1 the nearest-neighbor hopping. In the superconducting state, due to the composite effect of Raman vertex, gap symmetry, and Fermi surface topology, both B1g and B2g Raman intensities are dominated by α- (β-) band contribution for the extended s-wave (dx2-y2-wave) pairing, whereas both bands are equally important for the s±- wave pairing. It is shown that both extended s- and s±-wave pairings can lead to a good fitting for the reported B1g data Muschler et al. (2009) [11], while the dx2-y2-wave pairing seems not favorable.

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